Abstract This paper analyzes via the size effect method, the induced anisotropy in the fracturing behavior of 3D printed parts made using Acrylonitrile Butadiene Styrene (commonly abbreviated as ABS). The aspects of fracturing behavior considered include the strength, fracture toughness, the nonlinear fracture process zone (FPZ) size, and the degree of quasibrittleness. 3D printed ABS specimens of various sizes and various relative orientations of the pre-crack and the 3D printed layers are considered. The fracture properties are measured via fracture tests on single edge notch bending specimens. The measurements are seen to conform to the well-known size effect laws for strength and fracture toughness. It is demonstrated that the 3D printed parts exhibit considerable anisotropy in their fracturing behavior, which would not occur in the monolithic counterparts. This occurs not only for the strength and fracture toughness, but also the FPZ size and therefore the degree of quasibrittleness. The anisotropy stems from the crack path direction relative to the stacking direction of macrolayers and microlayers within a layer. The results show that these effects must be given due consideration when developing reliable designs for additively manufactured parts.

中文翻译：

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通过尺寸效应方法分析 3D 打印部件断裂行为的诱导各向异性

摘要 本文通过尺寸效应方法分析了使用丙烯腈丁二烯苯乙烯（通常缩写为 ABS）制成的 3D 打印部件的断裂行为的诱导各向异性。考虑的压裂行为方面包括强度、断裂韧性、非线性断裂过程区 (FPZ) 尺寸和准脆性程度。考虑了各种尺寸的 3D 打印 ABS 试样以及预裂纹和 3D 打印层的各种相对方向。断裂特性是通过单边缺口弯曲试样的断裂试验来测量的。测量结果符合众所周知的强度和断裂韧性尺寸效应定律。结果表明，3D 打印部件的断裂行为表现出相当大的各向异性，这不会发生在整体对应物上。这不仅发生在强度和断裂韧性上，而且发生在 FPZ 尺寸上，因此也发生在准脆性程度上。各向异性源于裂纹路径方向相对于层内宏观层和微层的堆叠方向。结果表明，在为增材制造零件开发可靠设计时，必须适当考虑这些影响。